A possibility I consider.
As you should.
Your OP certainly seemed to jump to conclusions. You said that the mother isn't promoting anything. You would have been more accurate to say that she isn't promoting
anything you're aware of... so far. When we consider that we can't even say who would have been in a position to perpetrate a hoax like this, we have to recognize that you really have no idea whether a potential fraudster might be able to make money off this somehow.
And, of course, money isn't the only motivation to perpetuate a hoax.
I am not too sure about this analogy, There is only one real Mona Lisa, right?
If you have a problem with it, then we can change it up: a Jackson Pollock. There are a number of Jackson Pollock paintings in the world. There's also a definite chance he painted something that he kept secret.
Even in that case, I'm not going to automatically believe someone who claims he has one.
If everyone is being honest, then the picture 'is what it is'. I am not sure what a real paranormal image must look like on photo capture.
The photo sensors on a modern camera are designed to sense light in roughly the same wavelength range as the human eye.
Another point is that if it was faked, someone probably would have made it more like something a skeptic would accept (if that is possible).
IOW, if it was actually faked, it would look less fake? Do you expect me to take this seriously?
What would "more like something a skeptic would accept" look like?